Minn. Stat. § 357.24: CRIMINAL CASES.

Witnesses for the state in criminal cases and witnesses attending on behalf of any defendant represented by a public defender or an attorney performing public defense work for a public defense corporation under section 611.216, shall receive the same fees for travel and attendance as provided in section 357.22. Judges also may allow like fees to witnesses attending in behalf of any other defendant. In addition these witnesses shall receive reasonable expenses actually incurred for meals, loss of wages and child care, not to exceed $60 per day. When a defendant is represented by a public defender or an attorney performing public defense work for a public defense corporation under section 611.216, neither the defendant nor the public defender shall be charged for any subpoena fees or for service of subpoenas by a public official. The compensation and reimbursement shall be paid out of the county treasury.